Audio Transformers
M i l - T - 2 7 E
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D e s c r i p t i o n
Triad high reliability audio transformers provide the durability and precision required in today’s
demanding designs. These transformers are available for a wide variety of applications. The line
of Red Spec audio transformers is designed and constructed to meet the rigid requirements of
MIL-T-27E. These transformers feature an epoxy molded case, gold plated leads and exceptional
operation from 300 Hz to 100 kHz.
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S p e c i f i c a t i o n s
Frequency Response Ranges: 300 Hz to 100 kHz
R e d S p e c
( M i L - T - 2 7 E )
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R e d S p e c P r i n t e d C i r c u i t A u d i o T r a n s f o r m e r s
Power
Level
in mW
Max. Ma DC
Unbalanced
in Primary
Overall
Turns
Ratio
Type
No.
Mil Type
No.
Matching Impedance
DC Resistance
Figure
No.
Section
Primary
Secondary
Primary
Secondary
A
B
C
SP-4
SP-5
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
10
25
200,000 CT
50,000 CT
1,000 CT
0.0
0.0
0.5
5,300.0
3,800.0
1,700.0
100.0
14.1:1.0
7.1:1.0
5.0:1.0
3
3
3
1,000 CT
75.0
SP-13
40 25,000 CT/20,000 CT
1,000/800 CT
115.0
SP-20
SP-21
SP-22
SP-29
SP-33
SP-42
SP-48
SP-49
SP-50
SP-51
SP-52
SP-66
SP-67
SP-68
SP-69
SP-70
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
TF5S21ZZ
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
50
10,000 CT
10,000 CT
10,000
10,000 CT
1,000
150 CT
7,500 CT
300 CT
500 CT
900 CT
1,500 CT
10,000 CT
600 CT
10,000
600
1,200 CT
2,000 CT
2,000 CT/500§
1.0
1.0
1.0
1.0
3.0
10.0
1.0
7.0
3.0
4.0
3.0
1.0
3.0
1.0
3.0
3.0
1,050.0
1,050.0
1,050.0
1,050.0
145.0
18.0
796.0
41.0
67.0
104.0
168.0
1,000.0
72.0
1,000.0
72.0
200.0
330.0
146.0/168.0§
80.0
8.0
2.7
2.9
98.0
98.0
96.0
92.0
1,300.0
92.0
2.88:1.0
2.24:1.0
4.48:1.0:1.0
4:47:1.0
4.4:1.0
3.54:1.0
25.0:1.0
1.0:1.42
1.0:1.1
1.22:1.0
1.58:1.0
1.0:1.0
1.0:1.0
2.1:1.0
3
3
4
3
1
2
2
2
2
2
2
3
3
4
4
1
500 CT
50
12
12
600
600
600
600
10,000 CT
600 CT
D
10,000 CT/2,500§
600 CT/150§
600
565.0/650.0§
40.0/45.0§
92.0
2.0:1.0:1.0
1.0:1.0
600
72.0
SP-128
SP-310
TF5S21ZZ
Shield Only
•
0.1H
•
5.0
15.0
•
•
5
E
CT = Center Tap § Split secondary
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O u t l i n e D i m e n s i o n s
2. Red Spec transformers are hi-pot tested at 1,000 VRMS.
3. 150 VDC working voltage.
T e c h n i c a l N o t e s
1. Plug-in terminals are precision spaced to provide
fixed mounting centers.
4. Red Spec transformers feature small footprint
base dimensions of .310 by .410 inch.
5. Pin diameter = .020 inch.
Split Windings
Inductor
CT Primary
Tap Primary - Tap Secondary
F i g u r e 1
F i g u r e 2
F i g u r e 5
F i g u r e 3
F i g u r e 4
www.TriadMagnetics.com 22520 B Temescal Canyon Road, Corona, CA 92883 Phone 951-277-0757 FAX 951-277-2757
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